The icon is shaped like a circle but the top right corner of it doesn't fully connect. At the center of the circle is a check mark. The end of the check mark sticks out the opening in the circle a bit.

This page shows the different variations of the Checked from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free.

Idea of Checked Icon by Anonymous

We've received the idea on April 23, 2012 and created the icons on May 9, 2012